Legends surround this jagged rock formation in the New Mexico desert.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

The ruins of the first Spanish settlement in Puerto Rico.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

This small fort played a huge role defending Puerto Rico’s capital city.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.